Executive Summary
| Informations | |||
|---|---|---|---|
| Name | CVE-2021-3656 | First vendor Publication | 2022-03-04 |
| Vendor | Cve | Last vendor Modification | 2023-01-19 |
Security-Database Scoring CVSS v3
| Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | |||
|---|---|---|---|
| Overall CVSS Score | 8.8 | ||
| Base Score | 8.8 | Environmental Score | 8.8 |
| impact SubScore | 6 | Temporal Score | 8.8 |
| Exploitabality Sub Score | 2 | ||
| Attack Vector | Local | Attack Complexity | Low |
| Privileges Required | Low | User Interaction | None |
| Scope | Changed | Confidentiality Impact | High |
| Integrity Impact | High | Availability Impact | High |
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C) | |||
|---|---|---|---|
| Cvss Base Score | 7.2 | Attack Range | Local |
| Cvss Impact Score | 10 | Attack Complexity | Low |
| Cvss Expoit Score | 3.9 | Authentication | None Required |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. |
Original Source
| Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3656 |
CPE : Common Platform Enumeration
Sources (Detail)
Alert History
| Date | Informations |
|---|---|
| 2024-03-12 13:18:20 |
|
| 2024-02-02 02:27:15 |
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| 2024-02-01 12:24:20 |
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| 2024-01-12 02:19:54 |
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| 2023-12-29 02:17:58 |
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| 2023-11-22 02:17:22 |
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| 2023-09-29 13:12:04 |
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| 2023-09-05 13:21:32 |
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| 2023-09-05 01:23:51 |
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| 2023-09-02 13:20:04 |
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| 2023-09-02 01:24:13 |
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| 2023-08-12 13:26:09 |
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| 2023-08-12 01:23:27 |
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| 2023-08-11 13:18:25 |
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| 2023-08-11 01:24:13 |
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| 2023-08-06 13:16:22 |
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| 2023-08-06 01:23:11 |
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| 2023-08-04 13:16:44 |
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| 2023-08-04 01:23:32 |
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| 2023-07-14 13:16:48 |
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| 2023-07-14 01:23:20 |
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| 2023-06-06 13:08:53 |
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| 2023-05-17 13:02:28 |
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| 2023-04-13 02:06:57 |
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| 2023-03-29 02:18:55 |
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| 2023-03-28 12:23:32 |
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| 2023-03-25 02:06:47 |
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| 2023-01-25 00:27:35 |
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| 2023-01-19 21:27:29 |
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| 2022-10-11 13:08:31 |
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| 2022-10-11 01:22:59 |
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| 2022-09-09 02:06:37 |
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| 2022-03-11 00:22:59 |
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| 2022-03-10 21:22:55 |
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| 2022-03-05 09:22:53 |
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| 2022-03-05 00:22:57 |
|
